I've found a lot of bugs. Sierra must've whipped together this demo pack very quickly. Here are some...
1: start the Gold Rush demo, wait for it to get to the screen with the boat. Use the arrow keys to crash it off track and go haywire!
2: start the Leisure Suit Larry demo, when in the screen at the bar, press "m" to go back to the menu. Select Larry again, when the bar screen comes on again, larry sitting down will be flikers of different views including the picture on the wall, another guy in the bar, etc.
3: the leisure suit larry demo clears two rows of text as white. go back to the menu by pressing "m" and you'll notice it didn't clear it back to black.
Not major bugs, but interesting none the less.